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Coffee Brewing Ratio Calculator

Tip: 1ml of water = 1 gram of water.
1 :
Common ratios: 15 (Strong), 16 (Balanced), 17 (Light).
function calculateCoffeeDose() { var water = parseFloat(document.getElementById("waterAmount").value); var ratio = parseFloat(document.getElementById("brewRatio").value); var resultDiv = document.getElementById("coffee-result-area"); var resultText = document.getElementById("resultText"); if (isNaN(water) || isNaN(ratio) || water <= 0 || ratio <= 0) { resultDiv.style.display = "block"; resultDiv.style.borderColor = "#e53935"; resultText.innerHTML = "Please enter valid positive numbers for both water and ratio."; return; } var coffeeRequired = (water / ratio).toFixed(1); resultDiv.style.display = "block"; resultDiv.style.borderColor = "#6d4c41"; resultText.innerHTML = "To brew " + water + "ml of coffee at a 1:" + ratio + " ratio:" + "
You need " + coffeeRequired + "g of ground coffee.
" + "Suggested Grind Size: " + (ratio 17 ? "Medium-Coarse" : "Medium")) + ""; }

Mastering the Coffee-to-Water Ratio: The Ultimate Guide

Every professional barista knows that the secret to a consistently delicious cup of coffee isn't just the quality of the beans—it's the precision of the coffee-to-water ratio. Whether you are using a Pour-over, French Press, or AeroPress, using a coffee brewing calculator ensures your brew is never too weak or too bitter.

What is the "Golden Ratio" in Coffee?

The Specialty Coffee Association (SCA) recommends a starting point known as the "Golden Ratio." For most manual brewing methods, this falls between 1:15 and 1:18. This notation means for every 1 gram of coffee, you use 15 to 18 grams (or milliliters) of water.

  • 1:15 Ratio: Results in a richer, more concentrated body. Ideal for those who enjoy a bold cup or add milk.
  • 1:16 to 1:17 Ratio: Considered the "sweet spot" for most specialty beans, highlighting the nuanced tasting notes of the coffee.
  • 1:18 Ratio: Produces a lighter, tea-like clarity. Great for delicate light roasts or high-altitude Ethiopian beans.

How to Use the Coffee Ratio Calculator

To use our tool, follow these three simple steps:

  1. Decide your volume: Determine how much liquid coffee you want to drink. A standard mug is usually 350ml.
  2. Choose your strength: Enter your preferred ratio (e.g., 16 for a balanced cup).
  3. Measure with precision: The calculator will tell you the exact weight of coffee beans you need in grams. For the best results, we always recommend using a digital kitchen scale rather than scoops or spoons.

Real-World Examples

Let's look at how the math works in common brewing scenarios:

Brew Method Water Amount Ratio Coffee Required
Single Pour-over 300 ml 1:16 18.8 grams
Small French Press 500 ml 1:15 33.3 grams
Standard Chemex 750 ml 1:17 44.1 grams

Beyond the Ratio: Extraction and Grind Size

While the ratio dictates the potential strength, your grind size and water temperature dictate how much flavor you extract. If your coffee tastes too sour, try a finer grind or hotter water. If it tastes bitter or astringent, try a coarser grind. Using this calculator alongside a consistent grind will help you dial in the perfect recipe every single morning.

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